Akitoshi Nakashima1, Tae Kusabiraki1, Aiko Aoki1, Azusa Sameshima1, Tomoko Shima1, Osamu Yoshino1, Shi-Bin Cheng2, Surendra Sharma2, Shigeru Saito1
(1. Department of Obstetrics and Gynecology, Faculty of Medicine, University of Toyama, Toyama city, Japan, 2. Department of Pediatrics, Women and Infants Hospital-Warren Alpert Medical School of Brown University, Providence, USA)